Aporcupine eats 3,000 j of plant material. of this, 2,100 j is indigestible and is eliminated as feces, 800 j are used in cellular respiration, and 100 j are used for growth and reproduction. what is the approximate production efficiency of this animal?

3%

Explanation:

The total energy ingested is 3000J and of those 3000J, 100J are used for growth and reproduction, this is the part of production in the porcupine, since the other 800J and 2100J are used for internal processes of the porcupine.

Therefore the production efficiency is 100J of the 3000J, let's find out how much it is in percentage:

⇒0.033=3.3% ≈ 3%

The correct option es 3% of production efficiency.

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there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

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since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.